Charge regulation in nanopore ionic field-effect transistors
Charge regulation in nanopore ionic field-effect transistors
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DOI：
10.1103/physreve.83.031203
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发表时间：
2011-03-18
影响因子：
2.4
通讯作者：
Stein, Derek
中科院分区：
文献类型：
--
作者：
Jiang, Zhijun;Stein, Derek
我们研究了 Al2O3 纳米孔晶体管的离子电导，以探测表面电荷密度及其对所施加栅极场的依赖性。观察到的电导调制完全归因于静电场效应，并且它们对 pH、离子强度和栅极电压的依赖性由定量模型描述。重要的是，这些实验揭示了反应性表面基团如何通过称为电荷调节的化学效应来主导纳米流体场效应装置的响应。对这种效应的定量理解有助于开发新的纳米流体技术。
We studied the ionic conductance through Al2O3 nanopore transistors to probe the surface charge density and its dependence on the applied gate field. The observed conductance modulations are entirely attributable to the electrostatic field effect, and their dependence on pH, ionic strength, and gate voltage is described by a quantitative model. Importantly, these experiments revealed how reactive surface groups dominate the response of nanofluidic field-effect devices via a chemical effect called charge regulation. A quantitative understanding of this effect enables the development of new nanofluidic technologies.